Nokia MetroSite Guide

Nokia MetroSite EDGE Base Station
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Maintenance
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Maintenance
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The information in this documentation is subject to change without notice and describes only
the product defined in the introduction of this documentation. This documentation is intended
for the use of Nokia's customers only for the purposes of the agreement under which the
documentation is submitted, and no part of it may be reproduced or transmitted in any form or
means without the prior written permission of Nokia. The documentation has been prepared to
be used by professional and properly trained personnel, and the customer assumes full
responsibility when using it. Nokia welcomes customer comments as part of the process of
continuous development and improvement of the documentation.
The information or statements given in this documentation concerning the suitability, capacity,
or performance of the mentioned hardware or software products cannot be considered binding
but shall be defined in the agreement made between Nokia and the customer. However, Nokia
has made all reasonable efforts to ensure that the instructions contained in the documentation
are adequate and free of material errors and omissions. Nokia will, if necessary, explain issues
which may not be covered by the documentation.
Nokia's liability for any errors in the documentation is limited to the documentary correction of
errors. NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THIS
DOCUMENTATION OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL
(INCLUDING MONETARY LOSSES), that might arise from the use of this documentation or
the information in it.
This documentation and the product it describes are considered protected by copyright
according to the applicable laws.
NOKIA logo is a registered trademark of Nokia Corporation.
Other product names mentioned in this documentation may be trademarks of their respective
companies, and they are mentioned for identification purposes only.
Copyright © Nokia Corporation 2002. All rights reserved.
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DN9913495 © Nokia Corporation Draft 3 (52)
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Hereby, Nokia Corporation, declares that this product is in compliance with the
essential requirements and other relevant provisions of Directive: 1999/5/EC.
The product is marked with the CE marking and Notified Body number according to the
Directive 1999/5/EC.
FCC FCC §15.21 - Information to user - This product is used as an intentional radiated
equipment and any changes or modifications on the equipment without any approval
by Nokia could void the user's authority to operate the equipment.
FCC §15.105 - Information to user - This equipment has been tested and found to
comply with the limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there
is no guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
0523
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DN9913495 © Nokia Corporation Draft 5 (52)
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Contents
Contents 5
List of tables 7
List of figures 8
1 About this document 11
2 Preparations for maintenance 13
2.1 Site folder 13
2.1.1 Fault reporting 13
2.2 Maintenance equipment 13
2.2.1 Nokia BTS Manager 14
2.3 Environmental precautions 14
2.4 Power supply precautions 14
2.5 Removing the BTS cover 15
3 Periodic maintenance 17
3.1 Maintaining the cabinet 17
3.1.1 Fan unit and air circulation 17
3.1.2 Cover 17
3.1.3 Seals 18
3.1.4 Lock 18
3.2 Periodic testing of the BTS 18
4 Adjusting the 13 MHz clock 19
5 Troubleshooting 23
5.1 Testing the BTS 23
5.2 Troubleshooting checklist 24
6 Replacing units 27
6.1 ESD protection 27
6.2 Removing units 28
6.3 Recycling of units 30
6.4 Replacing TRXs 30
6.4.1 TRX slot identification 30
6.4.2 Replacing a slave TRX 31
6.4.3 Replacing the master TRX in BTS configurations with two or more
TRXs 33
6.4.4 Replacing the master TRX in a single TRX BTS 34
6.5 Replacing the transmission unit 35
6.6 Replacing the interface unit 38
6.7 Replacing the power supply unit 39
6.8 Replacing the cooling fan 40
6.8.1 Replacing the HVMF cooling fan, version 1 40
6.8.2 Replacing the HVMF cooling fan, version 2 44
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7 LED indicator conditions 47
7.1 Transceiver unit LED 47
7.2 Transmission unit LED 48
7.3 Interface unit LED 48
7.4 Power supply unit LED 49
7.5 Fan unit LED 49
Index 51
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List of tables
Table 1. Power supply rules during maintenance procedures 15
Table 2. Troubleshooting checklist 24
Table 3. LED conditions for TRX units 47
Table 4. LED conditions for a transmission unit 48
Table 5. LED conditions for an RRI transmission unit’s Flexbus LED. 48
Table 6. LED conditions for an interface unit 49
Table 7. LED conditions of the power supply unit 49
Table 8. LED conditions for the fan unit 50
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List of figures
Figure 1. Safety strap on the MetroSite EDGE BTS cover 16
Figure 2. 13 MHz clock adjustment 20
Figure 3. Clock control window - coarse adjustment 21
Figure 4. Fine adjustment of the DAC value 22
Figure 5. Electro-static sensitive device symbol 27
Figure 6. Connecting the antistatic wrist strap. 28
Figure 7. Removing the units 29
Figure 8. TRX slot numbering 31
Figure 9. Example Object Properties window in Nokia BTS Manager (can be used
for blocking a TRX) 32
Figure 10. Displacing the sealing strip and releasing the cables 41
Figure 11. HVMF cooling fan assembly and mounting screws 42
Figure 12. HVMF fan assembly, version 1 43
Figure 13. HVMF fan assembly, version 2 45
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DN9913495 © Nokia Corporation Draft 9 (52)
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Summary of changes
Version 1, 12th November 1999.
Version 2, 22nd June 2000:
• Added GSM to title and body text
• Added high capacity fan assembly (Figure 5)
• Added 13 MHz clock adjustment procedure
Version 3, 30th June 2001:
• Updated for EDGE
• Added power supply rules, new fan controller module, BTS chaining
• Improved 13 MHz clock adjustment illustration
• Harmonised style
Version 3, July 2002:
• Note added to 13 MHz clock adjustment chapter that a high stability
frequency counter is required.
Version 3, October 2002:
• BTS Manager 3.0 commands added for replacing transmission unit.
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About this document
DN9913495 © Nokia Corporation Draft 11 (52)
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1About this document
This document gives instructions on the maintenance of the Nokia MetroSiteTM
EDGE Base Station (BTS). Read carefully Nokia MetroSite EDGE Base Station:
Warnings and Cautions before starting the maintenance work.
This document covers the following:
• preparations for maintenance
• periodic maintenance measures
• 13 MHz clock adjustment
• troubleshooting
• replacing units
• LED conditions of the MetroSite EDGE BTS units
Refer to the specific software release documentation for software updating
instructions.
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Preparations for maintenance
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Note
2Preparations for maintenance
This chapter describes the issues that must be considered in the maintenance of
the Nokia MetroSite EDGE BTS.
2.1 Site folder
A site folder contains site-specific information required on the site. The site
folders include installation, commissioning, and integration check lists. The exact
contents of the site folders are defined by the customer.
It is the responsibility of the customer to maintain and archive site-specific
documents.
2.1.1 Fault reporting
Where possible, correct all damage, failures, and faults and report them to Nokia
using the Failure Report Form provided by Nokia Customer Services.
You can save the alarm information to a log file on your PC with Nokia BTS
Manager.
2.2 Maintenance equipment
Check which tools are needed for the type of maintenance being done. For
information on the tools required, refer to Nokia MetroSite EDGE Base Station:
Requirements for Installation and Operation.
Always take the BTS key, antistatic wrist strap, and Nokia BTS Manager laptop
PC and LMP cable with you for BTS maintenance operations.
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Maintenance
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WARNING
2.2.1 Nokia BTS Manager
When replacing or adding units, Nokia BTS Manager software is used for local
management of the BTS. Instructions for running specific maintenance
operations with Nokia BTS Manager are included in the relevant sections of this
document.
For more general information on using Nokia BTS Manager, refer to Nokia
MetroSite EDGE Base Station: Commissioning.
2.3 Environmental precautions
When the cover of the Nokia MetroSite EDGE Base Station is removed to allow
for maintenance work, the following conditions must be considered:
1. Rain or snow must not be allowed to fall on the internal surfaces of the
equipment.
2. The cover must not be removed during conditions where dust can be blown
into the cabinet.
2.4 Power supply precautions
Potentially lethal voltages!
The BTS power must be switched OFF at the main disconnect device or
circuit breaker before starting maintenance work which involves the risk of
electric shocks.
When working inside the BTS cabinet, prevent injury to personnel or damage to
the BTS equipment by following the requirements presented in Table .
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Preparations for maintenance
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Note
2.5 Removing the BTS cover
Before removing the cover for internal maintenance of the BTS, refer to the
power supply precautions and environmental restrictions presented in this
document and to the safety precautions presented in Nokia MetroSite EDGE Base
Station: Warnings and Cautions.
Removing the cover issues an alarm to the BSC. Make sure that the BSC/NMS
personnel is notified before removing the cover.
Removing the BTS cover
1. Unlock the cabinet lock at the bottom of the BTS.
Table 1. Power supply rules during maintenance procedures
Procedure Power supply rule
Replacing a power supply unit or PSU
cable
Power OFF at main disconnect device
PSU switch to Stand-by
Replacing a grounding connection Power OFF at main disconnect device
PSU switch to Stand-by
Disconnecting or connecting antenna or
diversity cables on a TRX
PSU can be switched to ON but TRX
must be blocked
Replacing a TRX PSU can be switched to ON but TRX
must be blocked
Disconnecting or connecting
transmission cables
PSU can be switched to ON but TRX
must be blocked
Replacing a transmission unit PSU switch to Stand-by
Connecting or disconnecting cables to
the interface unit (VIFA)
PSU switch to Stand-by is advised
Replacing an interface unit PSU switch to Stand-by
Replacing a fan unit Power OFF at main disconnect device
PSU switch to Stand-by
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2. Remove the cover by sliding it upwards to disengage the hooks at the side
of the cover from the locking guides on the BTS chassis.
3. When the cover is free, pull it away from the cabinet and hang it on the
hook at the top left side of the chassis.
You can also remove the cover completely to place it on the floor. Remove
the safety strap before pulling the cover away (see Figure 1).
Figure 1. Safety strap on the MetroSite EDGE BTS cover
Fixing point
for safety strap
under the
cover top
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Periodic maintenance
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Caution
Caution
3Periodic maintenance
This chapter describes the periodic maintenance of the MetroSite EDGE Base
Station.
3.1 Maintaining the cabinet
This section describes the cabinet maintenance measures.
3.1.1 Fan unit and air circulation
The fan unit must be cleaned of leaves and debris whenever necessary. To
maintain proper circulation of air through the cabinet, air inlets and outlets must
not be obstructed.
3.1.2 Cover
Clean the BTS cover of stains and dust whenever necessary. Wipe the surface of
the cover with a piece of cloth moistened with water and a washing agent.
Do not use any washing agents that contain alkalis, esters, ketones, or aromatic,
chlorinated, or fluorinated hydrocarbons, since these may damage the cover.
Washing agents containing these chemicals can only be used if approved by the
manufacturer for cleaning polycarbonate objects.
Do not spill any water or chemicals inside the cover.
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3.1.3 Seals
Wipe the BTS seals (seal on the lower edge of the BTS, under the cover)
whenever they are dirty. The cleaning interval depends on the environment.
Check the visible seals during every site visit. If the seals are dirty, wipe them
clean with a piece of cloth. Replace worn or broken seals.
3.1.4 Lock
Lubricate the lock during site visits with lubricating oil. If the cabinet is used in
temperatures below 0ºC (32ºF), lubricate the lock with lubricating anti-freeze oil
or use both anti-freeze oil and lubricating oil.
3.2 Periodic testing of the BTS
The condition of the hardware in the MetroSite EDGE BTS can be tested
periodically by running the Abis loop test and the TRX test remotely from the
BSC/NMS. A TRX test can also be run locally with Nokia BTS Manager.
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Adjusting the 13 MHz clock
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Note
4Adjusting the 13 MHz clock
The 13 MHz clock is adjusted using the Nokia BTS Manager PC and a frequency
counter.
The 13 MHz clock should only need adjusting after a new installation or when the
interface unit (VIFA) is replaced.
Before commencing the adjustment procedure, switch ON the frequency counter
and allow for a stabilising time of about 15 minutes, or as recommended by the
instrument’s manufacturer.
Use only a high stability frequency counter for this procedure.
Adjusting the 13 MHz clock
1. Remove the rubber dust shield from the side of the interface unit.
2. Connect the frequency counter to the X7 connector on the interface unit
(first socket from the front). See Figure 2.
3. Connect the Nokia BTS Manager laptop PC to the LMP port of the
interface unit. See Figure 2.
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Figure 2. 13 MHz clock adjustment
4. Open Nokia BTS Manager on your laptop PC.
5. Open the calibration menu by selecting OBJECTS on the BTS Manager
main menu.
6. Select CLOCK CONTROL from the drop-down menu.
7. In the Clock Control window, enter a DAC (digital-to-analogue converter)
value which will tune the clock to 13 MHz (±1 Hz).
VIFA Unit
Frequency counter
Laptop fitted
with Nokia BTS
Manager
X7 LMP
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